Magnetics Business & Technology - November/December 2019 - 7

FEATURE ARTICLE
The electromagnetic system was a focus of attention, too. It
consists of the coil body including the coil and armature plate.
The brake generates the braking performance through pressure
springs. By activating the magnet, the brake will be released
and open since the magnetic force is working against the spring
force.

between different models and simplifies the manufacturing supply chain. While these changes mean lower production costs,
they also help to streamline maintenance and support activities.
All internal components are designed to resist corrosion and
offer enhanced durability under exposure to salt water or other
contaminants.

"Our target was to optimize the electromagnetic circuit as much
as possible in the available space to generate the maximum axial
force so that we increase the force of the springs and the brake
performance or torque. The coil is made from copper wire and
coated with a special insulation paint. Calculation of the coil characteristics, the windings and potting compound in the coil is done
in-house so we can define and produce the coils to accomplish
our design."

The HPB series is available in two-face or four-face configurations and with a brake torque range of 80 to 5,000 Nm. While
inspired by the demands of marine customers, it is also suitable
for use in many other industrial applications where long-term reliability and resistance to harsh environments are a priority, usable
for nearly all kinds of winches and hoists.

The outcome of all that work is Stromag's new High
Performance Brake (HPB) series. It is the most highly
optimized friction package the company has ever
produced for a dry electromagnetic brake and accomplishes a significant step-change in performance,
says Frank.
The improvement can be seen most clearly in the

M A G N E T I Z I N G
M A G N E T I C

M E A S U R I N G
S I N C E

New HPM line has 2-face and 4-face options
speed ratings for the new series. A 100 Nm HPB
brake, one of the smaller units in the range, is rated
for operation at 6,500 rpm, while its predecessor had
a maximum rated speed of 3,000 rpm. The difference
becomes even more significant as the brakes get
larger. The 4,000 Nm variant of the HPB is rated to
3,250 rpm, while its predecessor was deigned to operate at 1,000 rpm.
But what about the cost issue? Frank points out that
the new design also provides significant benefits here.
"The higher power rating of the new brakes mean that
customers can often select a unit one or two frame
sizes smaller for a given application with corresponding cost savings."
The entire system is designed to be simple, robust
and easy to assemble, he notes. Part count has been
reduced, for example, by replacing separate covers
with a part integrated into the body of the brake. The
series uses a modular design that shares components
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specializing in engineering, design and manufacturing
of magnetizing and magnetic measuring equipment.

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November/December 2019 * Magnetics Business & Technology

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Magnetics Business & Technology - November/December 2019

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